PermitStack indexes 149,908 building permits issued in King County, Washington, with 17,680 issued in the last 12 months alone. Search by address, contractor, category, and date via our free REST API.
Most common permit types issued in the last year.
Most active contractors by permit volume in King County.
The 10 most recent permits issued in King County, Washington. Full dataset available via REST API.
| Issued | Permit # | Address | Category | Description |
|---|---|---|---|---|
| No recent permits. | ||||
Query King County, Washington permits with a single HTTP request. Returns JSON with address, category, status, dates, and full description.
# Search all King County permits issued this month curl -H "X-API-Key: YOUR_KEY" \ "https://api.permit-stack.com/v1/permits/search?city=King%20County&state=WA&issued_after=2026-04-01"
Related coverage in Washington and nationwide.
We ingest data directly from the official King County open data portal (the official city portal) daily. This is the same source used by the city's own public dashboards, normalized into a consistent JSON schema across our U.S. jurisdictions.
Our automated ingestion runs daily at 03:00 UTC. The latest permit in our database for King County, Washington was issued on July 20, 2026. Permit backlogs on the city side may mean some permits take a few days to appear.
Yes — our free tier includes 100 requests per day, enough to search and filter King County permits interactively. Sign up for a free API key to get started.
Yes. Paid plans support CSV export and periodic webhooks for changed permits.
Most King County permits are issued on the same day they are filed, reflecting electronic submission and same-day processing for routine permit types. Larger or more complex projects (new construction, major additions) often take longer.
Free tier covers 100 requests per day. No credit card required.
Get Free API Key